Mandrel for winding coils.



A. D. SCOTT.

MANDREL FOR WINDING COILS.

APPLICATION FILED 1AN.12.1912.

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A. D. SCOTT.

MANDREL FOR WINDING COILS. APPLICATION mso JAN. 12. 1912.

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MANDREL FOR WINDING COILS. APPucArloN man MN.12.|912.

Patented Jan. 11, 1916.

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MANDREL Fon WINDING cons. APPLICATION yFILED IAN. I2, I9I2. Ljljl, Patented Jan. 11, 1916.

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Patented Jan. 11, 1916.

A. D. SCOTT.

mlllllillllll IIIIIIELIIIII MANDREL FOR WINDING COILS.

APPLICATION man 1AN.12,1912.

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of which is constructed to form round or cy` of the coil therefrom; Fig. 3 is a section on,

wherein:

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ARCHIBALD D. SCOTT, OF JERSEY CITY, NEW JERSEYASSIGNOR lO VARLEY 1DUPLEX MAGNET COMPANY, 0F JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MANDREL For. WINDING coILs.

Patented J an. ilil, 1916.

Original application led September 27, 1910, Serial No. 584,040. Divided and this application filed January 12, 1912. Serial No. 670,794.

To all whomvt may concern.'

Be it known that I, ARCHIBALD-D. SCOTT,

a citizen .of the United States, residing in Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Mandrels' for Winding Coils, of-which the following is a specification.

My invention relates to new and useful improvements in winding mandrels upon which a strand'or strands may be wound or coiled, and contemplates a mandrel which is so constructed that it may be readilyv collapsed within the winding so that the latter can be detached therefrom.

In the drawings I have shown two embodiments of this feature of the invention, one

lindrical coils and the other of which is adapted to form polysided coils.

This application is a division of my ,pending application Serial Number 584,040, filed in the United States Patent Ofiice September 27, 1910.

The invention consists in the novel confully described hereinafter, andthe novelty of which will be particularly pointed out andv distinctly claimed.

I have fully and clearly illustrated my 'invention in the accompanying drawings to be 4taken as a part of this specification and Figurel is a longitudinal vertical section through a mandrel for holding and forming the winding;''E Fig. 2 is a longitudinal vertical section 'through theA mandrel showing the same in condition to, permit detachment the line 10, 10 of Fig. 1; Fig. 4 is a detail lview of one of the `iiller blocks with a foundation guide section thereon; Fig. 5V is a section on the line 5, 5' of Fig. 1; Fig. 6 is a longitudinal vertical section through another frm of the mandrel; Fig. 7 isa section .on the line 14, 14-of Fig. 6; Fig. 8 is a view in `end elevation of one of the end plates for the mandrel; Fig.` 9 is a detail perspective view of one of the filler blocks forming part of the mandrel shown in Figs.

6 and.7 Fig. 10 is a viewin end elevation of another form of mandrel; Fig. 11 is a ver- 'tical central section through the mandrel shown in Fig. 10; Fig. 12 is a view in end elevation of the filler blocks used in connection with the mandrel shown in Fig. 10; Fig. 13 is a longitudinal vertical section taken through a mandrel for making a plu-Y rality of windings; Fig. 14 is a view in elevation of one of the flange plates of the mandrel shown in Fig. 13;'Figs. 15 and 16 vare views of the filler blocks used in connection with the mandrel, shown in Fig. 13;

guide for receiving and guiding the windings on the mandrel; Fig. 18 is a development of another form yof the foundation guide; Fig. 19 is a view of the strand guiding means shown in connection with the form of the mandrel illustratedin Figs. 6 to 9 included; Fig. 20 is a detail view in section of a strand guide in connection with `Fig. 17l is avdevelopment of a foundation the mandrel shown in Figs.' 10 to 12 in V eluded; Fig. 21 is a view in end elevation partly in section of one form of mandrel flan-ge plate; and Fig. 22 is a section through a mandrel equipped with the iiange plate shown in Fig. 21.

' l designates a spindle or-center-piece upon 4 which the parts of the improved mandrel 6 designates a cylindrical core piece which l is threaded into the hub 2 in longitudinal alinement with the shaft 1, said core piece vhaving a longitudinal bore 7 intersected by a transverse slot 8 extending entirely acr oss and through the core piece. Pro]ect1ng through this core piece 6 is a cross key 9, adapted to be moved back and forth in the slot 8 lengthwise of the core piece, said key beingl operable by a plunger 10, slidably disposed within the Vbore of the core-piece.

Mounted n the core-piece is a second Aflange plate 11 spaced from the plate 3 by a yShoulder 12 on thev core-piece against which it abuts, said second plate having a smooth inner plane face 13, said flange plates defining al space about the core-piece within which the winding is to be formed. The

. plate 1 1 is held in place in engagement with the shoulder 12 by a clamping nut 14 threaded onto the end of the core-piece. Slidable on the core-piece between the plates 3 and 11 is a collar 15 frusto conical in form and having its larger end toward the Iplate 3, and its smaller end toward the plate l11.' The diameter of the larger'end of the collar is such that it may be received by the "recess 5 in the plate 3.

Mounted on and supported by the collar is a plurality of filler blocks 16 having their outer faces parallel with the axis of rot-ation of the spindle 1 and each has an inner ,inclined face 17, curved to rest on the surface of the collar and said filler blocks beingeach slidably connected to said collar `"by a key 18 seated in alining grooves 19 ,fand 20, formed respectively in the collar and filler block. The keys may be formed to -connect the collar and filler Apieces to pre- `vent lateral or radial separation thereof .when the winding is removed. For this i purpose the grooves in the collar may be undercut at 21 to receive lateral'projections 22 on the keys, the keys being secured in the grooves of the blocks by locking pins l23 set in alining recesses 24 in the sides of :the keys and the side walls of the block grooves.

The cross-key 9, heretofore described, pro- ]ects at lts ends beyond the core-piece into recesses 25 in the collar 15, and it will be seen that when the said key is moved length- 'wise of the slot 8 the collar will cause the filler blocks to move radially toward or away from the core-piece accordingly as the collar is moved toward the end plate 3, or the end plate 11. The filler blocks are-held against movement lengthwise of the shaft by the end plates. When the winding is i turned to release the plunger and the latter 11 to be detached, so that is moved in to slide the collar 15 lengthwise of the shaft to permit the filler blocks to collapse, the .rear end of the collar moving into the recess in the plate 3, and the nut 14 is then removed to permit the Harige plate the winding` may be drawn from the mandrel.

In Figs. 6 to 9 I have shown a mandrel for use in forming a poly'sided winding, in the present instance a winding having four sides. In this form of the invention I employ' a number of features which are incommon with those described in the form shown in Figs. 1 to 4. In this form of the invention, the main portions of the mandrel may be constructed in substantially the saine form and arrangement as in the form shown in Figs. 1 to 4, the end plates, the core-piece and the sliding collar, together with a plunger for l operating the latter, being all the same, as shown in said figures. The diEerence between these two forms resides in the construction of the filler blocks; in the present instance, four blocks being employed, each having an inner curved inclined surface 27 to rest on, and conform with the outer surface of the sliding collar, the filler blocks being secured in position by keys in the saine manner as in the form first described. These filler blocks are each provided with outer straight faces 28, which are substantially at right angles to each other, So that when the filler blocks are assembled upon the collar, they combine to form a substantially rectangular body. The operation of this mandrel in supporting and lAreleasing the winding, is substantially the same as that of the form first described, the collar being shifted toward the recessed plate to withdraw the filler blocks andpulled to-ward the end of the core-piece to expand the blocks.

y In Figs. 10, 11 and 12 I have shown another form of the mandrel for winding-.polysided coils. In this construction, the hub 29 of a flange plate 30 is threaded onto the spindle 1, said end plate having a. recess 31, at its central portion, and threaded into the hub 32, in alinement with the spindle 1 is a core-piece 33, which is conical in shape, the base of the cone'being located within the recess in the end plate, and the opposite end of said core-piece having a 'threaded shank 34 t receive an outer end plate 34a, which is held in place on the corelpiece by a nut 35. Arranged on the conical portion of the core-piece between the end plates, is a plurality of filler blocks 36, shown as being four in number and each provided with an inclined inner curved surface 37y to rest on the curved surface ofthe cone. The core-pieces are formed with outer surfaces 38 at right angles toeach other, and the arrangement is such that when the mandrel is assembled, the faces 38 of the corepieces aline to provide a substantially rectangular body to receive the turns of the magnet winding. In all of the forms of the mandrel described, the ange plates are provided with a plurality of slots 39, through which tying bands may be passed in order to tie the layers of the winding together to prevent separation thereof when theV winding is removed from the mandrel.

In Fig. 11 one of the filler blocks is'shown detachably secured to the end plate 30 by a bolt 40 so that said block constitutes a` bracket for the support of the winding when the end plate 34a is removed.

In the form of the'mandrel shown in Figs. 13 to 16, inclusive, wherein it is intended to make a plurality of windings simultaneously, I provide a flange plate 41 with a hub threaded onto the spindle 1, said flange plate being provided with a conical boss 42 constituting a core-piece, and performing the 'same function as the sliding collar of the i .Y rectangular body to receive the winding.

Each of the filler blocks is provided with a groove .47 to receive a pin 48 carried by the end plate 41, whichpr'events rotation of the filler blocksfaround the boss 42. The filler blocks are moved up on the boss in a posi- -tion to receive the winding by an end plate- 49 which is arranged on a spindle 50, threaded into the hub of thefirst-mentioned end plate, and is adapted to be' moved into engagement with :the ends ofthe said filler blocks in a manner to be hereinafter described. This second end plate 49 is mounted on a hub 51, which carries another plate` 52 spaced from said second plate 49, and said hub is also formedv with a boss 53 similar to that-heretofore Idescribed to receive filler blocks and securing means therefor whichr may be entical in construction with those just described. These filler blocks constitute the core' for a second 'winding and are heldin place by a similary 'structure,vin cluding an endplate 54 andhub 55 with'its spaced end plate and boss such as heretofore described the boss in this instance also supporting filler blocks The final end plate consists of a circular plate 56 on the spindle 50 and held thereon by'a nut 57 threaded on thef end of said spindle. When'the wind-VY ings are to be made, theparts are assembled as shown inFig. 13', the nut 57 being securedup against the end plate so as to move all of the elements longitudinally of the spindle 50 and expand the filler blocks upon the conical bosses. e

, An important feature of this invention vconsists in providing the mandrel, whether it is designed to make round windings orl polysided windings, with means whereby the turns of the layers constituting a winding, will be arranged in regular form so that alternate layer-s are counterparts of eachother throughout the entire winding, the result being that I provide a completed article which is much more compact for a given weight of wire than' any winding which has been produced heretofore, as far as I am aware, and which not only makes a winding which is much more compact, but results in apgreat saving of wire, which, of course, in copper windings is important. In order to arrive at this result, my invention broadly contemplates the provision of the mandrel with means whereby the first layer of the winding is laid between-the flanges f the mandrel with great precision this winding serving vthen asa guide for the next layer` and. so on throughout the article produced.

I have, up to the present time, contemplated` in order that the arrangement of strands inlayers ,will be such that it is repeated as layer after layer is wound on the core.

In Fig. 17, IV have shown one form of guide which consists of a plurality of curved lates 58 adapted to be laid on the outer surace of the mandrel, of the form shown 1n Figs. l1 to 5, for making a round lndlng, these plates being formed with a plurality of grooves 59 and intervening ridges 6 0, Which grooves are to receive the strands of the initiallwinding, which strands` are separated by the ridges. Of course, 1n .making a winding-'of this character, the strand, 1s laid on the mandrel in the form of a -vcoil and in order that the strand be guided laterally so as to take substantially the direction of a coil, two of the plates, as for instance the tWo middle ones as shown in the diagram, are formed with a half groove adjacent the starting flange, whilethe two outer plates are formed with a whole groove adjacent the starting flange. startpf the Winding is against the end plate in one'of the whole grooves of the plate a, it will follow the same as the mandrel revolves, until it reaches the alining whole groove in the plate b, which it follows until it reaches the first whole groove in the plate c when it willkbe forced laterally into said whole groove and follow the same. The strand follows this whole groove in the If now, for instance, the

plate c' until itreaches the. plate lZ when it which it follows until it reaches the second whole groove in the plate c which, as shown in Fig. 17, isolfset laterally the distance of a half a groove from the second -whole groove in the plate Z, which continues throughout the entire winding, the strand being successively offset from the plate d onto the plates a and b and then offset from the latter onto the plate c. The points of offset, that is, between the plates d and a and b and c, are preferably arranged at diametrically opposite points on the mandrel so that each half turn of a layer of the winding is offset a distance equal to one-half the diameter of the strand being wound. `By this operation, under the influence of the guide described, every turn in the first layerl is laid in exactly the same direction and form as any other turns, and the turns of the layer first formed, 7form a rigid guide in which the turns of the next layer are laid with the same accuracy as the first layer was forced to take by the foundation guide, and

this continues throughout the winding. I.

prefer to form these plates separately in; stead of in a continuous piece for the reason that in making a round winding it is desirable to get as much of the winding as possible parallel with the flanges, and therefore, the offset must be as short as practicable. It will be seen that while each turn is offset twice in going around the mandrel, the portions between the offsets lie parallel to the end plate.

-In Fig.` 18, I have shown the foundation guide as being made in a continuous piece in substantially the same arrangement as shown in Fig. 17, except that I am unable to obtain the short offsets accomplished by the arrangement shown in Fig. 17. In Fig. 18, the foundation guide is shown developed in plan and embodies 4 zones, the cut being made through one of the zones' so that in the figure shown, a portion of,y a zone appears at each end of the figure. In this embodiment two Zones 61 are provided, each formed with a plurality of parallel grooves which run at right angles to the axis of rotation of the mandrel or parallel to the flat faces of the mandrel and flanges, the grooves of one of said zones being offset laterally from those of the other the distance of one half a groove, and said Zones being joined at their ends by zones 62 of inclined grooves, each groove of which joins one of the straight grooves of one of the zones 61 with the next offset groove of the other zone 61. The arrangement may be stated to be practically the same as that shown in Fig. 17, except that the zones of parallel grooves are joined by Zones of inclined grooves instead of be- Aing separated. from each other. The result produced in the winding is substantially the same.

When the form of winding to be made is 'polysided, I preferably do not employ the guide plates shown in Fig. 17, or the continuous plate of Fig. 18, but may provide each of the outer angles which join the receiving faces of the filler blocks with aplu rality of grooves or corrugations so that the wire or strand in passing from one face'of a polysided mandrel to the other, will be lguided by these corrugations. I prefer to form the filler blocks with a longitudinal groove 63 within which is placed a pin 64, which is of a length selected according to the -length of the coil to be formed, said pin being provided with grooves 65, which are formed to correspond to the diameter of the wire to be wound. 'It'will be 'understood that preferably there is a pin arranged at the outer angle of each filler piece, in the embodiment shown in the drawings, said pin being of a length equal to that of the filler block and abutting the end plates of the mandrel at their outer ends. Each of these pins is provided with a plurality of annular grooves and intervening ridges, the grooves being intended to receive and guide the strand as it turns the angle of the filler piece. It will be understood that there is a separate set of pins to be used for each winding, the same being selected according to the length of the coil and diameter of the wire. All four of the pins are not the same in the arrangement ,of the grooves therein in the embodiment heretofore described. For instance, the first two are arranged with a .whole groove at the starting point of the winding against the end plate, while the second two would be-provided with a 'half groove at the starting end. For instance, suppose the-first two pins were to start adjacent the flange with a full groove and to end with a full groove, then the second two pins would start and 'finish with half grooves at 'their ends. If the starter pins should commence with a full groove and end with a half groove, then the finishing pins would start with ahalf groove at one end'and end tween the apexes of the ribs between the grooves is equal to the diameterof the wire to be wound on any particular set of pins, and that a half groove will be equal to onejacent the end plate and then comes to one halfof the diameter of the wire. In using the pins, supposinga winding is started in the full groove adjacent one of the end plates, as the mandrel is turned the wire passes to the full'groove of the next pin adof the pins which has a half groove adjacent the end plate; the wire canno-t enter the half groove and must .take the next full groove which is adjacent to the half groove so that the wire is deflected laterally across the face of the mandrel, a distance equal to lthis continues until the whole face ofthe mandrel between the end plates is covered with a layer. If the starter -pins terminate with a full groove, then the finishing pins terminate with aA half groove and after thefirst layer has been completed, the strand will ride up on .the half groove ends of the v finishing pins adjacent the fiange and constitute the first turn of the -return layer, which is to lie upon the top -of the first layer. Then during `the return of the wire the return layer is guided by the first layer f a coll of less length than the distance belaid on the mandrel.-

The pins may be secured in posltion in Aany suitable manner, as for instance by a dou le headed securing device 66, one head of which is `seated in' a recess 67v at the end of the pin and the other end of which is seated in a recess 68 in the end of the filler piece, said last mentioned head being secured in position if desired by a screw 69.

In theA form offthe mandrel shown in Figs. 10'to 12 respectively,;I may employ a different wform of means 'for starting the first layer so that it constitutes a guide for succeeding layers. In this form I do not use fa guide extending entirely across the face of the mandrel but employ a `device whichmakes the first turn take a determined course, so that the subsequent turns, when laid against the same, will take a corresponding 'course across the face of the mandrel. In this form of invention `I employ a guide or projection secured to the mandrel and extending beyond the receiving face thereof, a ndistance equal to the diameter of the wire and of a thickness equal to onehalf the diameter ofthe wire,-saidj device being arranged flush against one of the end plates. This` device may take a number of forms but I prefer to employ av pin470 seated in a recess 71, in the end o f two of the adjacent filler blocks,v said pm. having an y enlarged head 72 which abuts the end plate 7 3, and projects beyond the face of the mandrel between the end plates, said head having a rounded surface as at 74, sothat it practically constitutes, in eect, a half strand of wire laid against the end plate. When the wire is then wound on the mandrel, it will be held away from the end plate a distance equal to one-half its diameter by the projecting head of this pin, at two of the corners of the mandrel, but will lie against the end plate at kthe other corners ofthe mandrel. As the coil is wound, all of the succeeding turns of the first layer will be correspondingly laid .and the turns of the second layer will be guided by the turns of the rst layer, the final turn resting in the groove formed by the head 74, and the next adjacent turn of the first layer, 75, the head 7 4 preventing the next to last turn of the second layer from forcing the end turn of the first layer away from the second turn ofthe rst layer.

The filler blocks for the mandrel may each be formed with a longitudinal rabbet 7 6, which when they are assembled coincide to form grooves longitudinally of the mandrel through which 'binding' ystrips may be aslsed between the winding and the man- In Figs. 21-22 is shown an arrangement by which I am enabled to use the same mandrel, its end plates and filler blocks to wind tween the end plates, I accomplish this by employing inserts 77 preferablysector shaped which are arranged onthe flat face of one of the end plates and secured thereto between the end plates by screws 88 shown in dotted lines in" Fig.l 22. In this instance I- angles to each other, said plates 'being arranged to project within longitudinal grooves 90 in the sides of the pins, the latter slidably engaging ,said strips.

In Fig.- 15 the strips 89 are secured in place by being inserted in grooves 89%` in the filler blocks, while in Figs. 21 and 22, the said strips may be secured by any suitable means to the fiat faces of the filler blocks Instead of using a' rigid metal guide.'

take the form of a continuous strip as in Fig. 18 or several short strips, as in Fig. 17

I do not specically claim herein the form of mandrel shown in Figs. 10, 11, 12'and 20, but have made the same specifically the subject-matter of a divisional application led September 6, 1912, Serial No. 718,812'.

What I claim and desire to secure by United States Letters Patent is:

l. An expansible and contractible mandrel for winding coils, having independent sets of strand-guiding grooves on the receiving surface thereof, the grooves of each set running substantially parallel to the direction of rotation of the mandrel, the grooves of one set being offset lengthwise of the mandrel from the grooves of another set, and means whereby said mandrel is expansible and contractible.

2. An expansible and contractible winding mandrel vcomprising a core piece, ller blocks lon the core piece, means whereby said blocks are movable in and out radially of the mandrel, and sets of strand-guiding grooves on said blocks, said grooves running substantially parallel to the direction of rotationI of the mandrel, and the grooves of one set being offset lengthwise of the mandrel from the grooves of another set.

3. A polysided winding mandrel having end flanges, and a corrugated strand guiding pin extending longitudinally of the mandrel 'from flange to liange.

4. A polysided windingA mandrel having a corrugated strand guiding pin extending longitudinally thereof at a juncture between the sides.

5. A polysided winding mandrel having corrugated strand guiding pins extending longitudinally thereof, the corrugations of one pin being odset from those of the preceding pin in the direction taken by the strand in being wound. y

6. A polysided winding mandrel havin corrugated strand guiding pins extending longitudinally thereof, the corrugations of one pin beingoffset from those of the preceding pin in the direction taken by the strand'in being wound a distance equal substantially to one half a corrugation.

7. A winding mandrel' having setsl of strand-guide grooves on its receiving face, the grooves of each set running substantially parallel to the direction of rotation, and the grooves of one set being offset `lengthwise of the mandrel from another set. 1

8. A polysided winding mandrel having sets of strand-guiding grooves at the junctures of its sides, the grooves of one set at one point being offset lengthwise of the mandrel from the grooves of a set at another point.

9. A polysided winding mandrel having strand-guiding grooves at different points about its periphery, said grooves being substantially parallel to the direction of rotation, and the 'grooves at one point being rei 11. An expansible and contractible manj drel for winding coils, having independent sets of strand-guiding grooves on the receiving surface thereof, the grooves of each set running substantially parallel to the direction of rotation of the mandel, and the grooves of one set being offset lengthwise of the mandrel from the grooves of another set a distance approximately one-half the width of a groove.

12. A polysided winding mandrel having corrugated strand guiding pins extending longitudinally thereof and spaced from each other about the mandrel, the corrugations of said pins extending in the general direction of the rotation of the mandrel.

13. A winding mandrel having corrugated strand-guiding members extending longitudinally thereof and spaced from each other about the mandrel, the corrugations of said members extending in the general direction of the rotation of the mandrel substantially parallel to the direction of rotation and the corrugations of one member being odset respectively lengthwise of the mandrel from the corresponding corrugations of another member.

14. A winding mandrel having sets of equidistant strand-receiving spaces and .intervening projections, said setsbeing spaced from each other about the mandrel, and the spaces of one set being respectively offset lengthwise of the mandrel from the corresponding spaces of another set and said spaces and projections being so arranged as to cause the turns of a strand wound thereon to be laid parallel to each other in the general direction of rotation of the mandrel throughout a portion of the receiving face of the mandrel and .to be offset lengthwise of the mandrel throughout another portion of the receiving face.

15; A polysided winding mandrel having Y l the mandrel throughout a portion of the recarried thereby andl operating individually In testimony whereof l have hereunto on each turn to cause the turns of a strand signed my name in the presence of two sub- 10 Wound thereon to be laid parallel to each scribing Witnesses.

other in the general direction of rotation of ARCHBALD D SCOTT eeiving face of theA mandrel, and to be odset Witnesses: lengthwise of the mandrel throughout an- C. Gr. HEYLMUN other portion of the receiving face. W. A. PAULING. 

